Paper file



PAPER FILE Filed Aug. 30,' 1929 fn wn im,

iia'tented May 27, 1930 UNTE STATES THURE RENGMANN, OF BERLIN-CHARLOTTENBURG, GERMANY PAPER FILE Application led August 30, 1929, Serial No. 389,548, and in Germany August 10, 1928.

rlhis invention relates to a paper file of the post or prong type and consists in the provision of a binding device in the form of two strips one of which is superimposed and slidably guided on the other, the strips being provided with apertures whereby they are threaded on the prongs of the file and controlled by a spring tending to maintain them in a relative position wherein they are loosely guided on the prongs, a toggle mechanism being provided whereby the strips can be relatively displaced so as to grip the prongs.

Fig. 1 of the accompanying drawings represents a longitudinal section of the binding strips in their normal relative position,

Fig. 2 is another longitudinal section showing the strips in operation in a prong iile and clamped to the prongs,

Figs. 3 and et are top views of the strips showing them in dierent relative positions, and

Fig. 5 is a side view of a file showing the binding device in operation.

The binding device comprises two metal strips l and 3 the latter of which is superimposed and guided on the former. The bottom strip 1 is formed with raised edges 2 and 2 and with inturned lugs 4 which engage over the strip 3 so as to keep the two strips together. rlhe strips are formed with apertures 7 and 6 respectively whereby they are threaded on the prongs 14 of the le on top of the paper sheets. The apertures are large enough to enable the strips to move freely on the prongs. A spring 5, accommodated between the strips, tends to maintain the lat-V ter in a relative position wherein their apertures are substantially in register, as shown in Figs. 1 and 3, and allow the binding device to move freely. By a relative displacement of the two strips, however, as shown in Figs. 2 and 4, the edges 8 and 9 ofthe apertures can bevmade to grip the prongs and secure the binding device to the latter with the paper sheets clamped between the device and a back plate as shown in Fig. 5.

The relative displacement of the strips is effected by means of a toggle mechanism comprising two plate members 10 one of which is formed with a nose piece whereby it engages in an aperture in a bend 11 on the other plate member so as to form a hinge joint. rThe free end 13 of one of the plate members rests against lugs formed on the raised edges Vof the strip 1. The free end of the other plate member is 'formed with lugs 12 which engage in apertures in a transverse corrugation on the strip 3.` Normally the plate members are maintained by the spring 5 with the joint in raised position as shown in Fig. 1. Finger pressure on the joint will cause the free ends of the plate members to spread apart and the binding device to be secured to the prongs 14. The joint passes across the dead centre position, as shown in Fig. 2, and the spring 5 will therefore tend to maintain the toggle mechanism in fully depressed position.

The strip 3 may be formed with several tranverse corrugations, as shown in Figs. 1 and 2, so that it can resiliently adapt itself to prongs of different sizes.

I claim;

1. In a paper file of the post or prong type, a binding` device comprising two strips one of which is superimposed and slidably guid' ed on the other, said strips being provided with apertures whereby they are threaded on the prongs, a spring tending to maintain the strips in a relative position wherein they are freely movable on said prongs, and a toggle mechanism whereby the strips can be relatively displaced so as to grip the prongs.

2. A device as claimed in claim 1 wherein the toggle mechanism comprises two interengaging relatively deleotable members, the strips being provided with elevated abutments for the ends of said members allowing the inter-engaging ends thereof to move across the dead centre position.

3. A device as claimed in claim 1 wherein the upper strip is formed with transverse corrugations.

THURE RENGMANN. 

